UW Burke Herbarium species comparison

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Cirsium altissimum

Cirsium brevistylum

clustered thistle, short-styled thistle
Habit Robust, tap-rooted perennial, 9-25 dm. tall, the stem succulent, thick below and tapering.
Leaves

Leaves green and only lightly loose-white-woolly below, weakly spiny, pinnatifid or coarsely toothed.
Flowers

Heads clustered at the ends of branches and the main stem, often surpassed by the leaves;

involucre 2-4 cm. high, strongly spider-webby, not much inbricate, its bracts slender and tapering, all but the inner with short spines;

flowers all tubular, the tube very slender, dull purplish-red, 12-18 mm. long, the corolla lobes 2-4 mm. long;

receptacle densely bristly.

Cirsium altissimum

Cirsium brevistylum
Flowering time June-August
Habitat Slopes, open forest, and moist meadows from low to middle elevations in the mountains.
Distribution
[WildflowerSearch map]
[BONAP county map]
Occurring on both sides of the Cascades crest in Washington; British Columbia to northern California, east to Montana.
[WildflowerSearch map]
[BONAP county map]
Origin Native
Conservation status Not of concern
Sibling taxa
C. arvense, C. brevifolium, C. brevistylum, C. edule, C. flodmanii, C. hookerianum, C. inamoenum, C. remotifolium, C. scariosum, C. undulatum, C. vulgare
C. arvense, C. brevifolium, C. edule, C. flodmanii, C. hookerianum, C. inamoenum, C. remotifolium, C. scariosum, C. undulatum, C. vulgare
Web links 
Unless otherwise noted, all data comes from the University of Washington's Burke Herbarium.



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